unhealthy

[uhn-hel-thee]
adjective, unhealthier, unhealthiest.
1.
not in a state of good or normal health; in an unsound, weak, or morbid condition.
2.
symptomatic of or resulting from bad health: an unhealthy pallor.
3.
not conducive to good health; unhealthful: Night air was formerly considered unhealthy.
4.
morally bad, harmful, or contaminating: unhealthy examples for the young.
5.
dangerous; risky: Asking questions in this neighborhood can be unhealthy.

Origin:
1585–95; un-1 + healthy

unhealthily, adverb
unhealthiness, noun


1. sickly. 3. unhygienic, deleterious.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unhealthy (ʌnˈhɛlθɪ)
 
adj , -healthier, -healthiest
1.  characterized by ill-health; sick; unwell
2.  characteristic of, conducive to, or resulting from ill-health: an unhealthy complexion; an unhealthy atmosphere
3.  morbid or unwholesome
4.  informal dangerous; risky
 
un'healthily
 
adv
 
un'healthiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

unhealthy
1595, "injurious to health," from un- (1) "not" + healthy. Earlier unhealthsome (1544), unhealthful (1580). Of persons, "sickly," it is attested from 1611.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They may be unhealthy and lacking in vital nutrients.
His body is absolutely free from unhealthy humours, and so he still performs
  all the duties and functions of a king.
But increased productiveness is not secured by excessive labor amid unhealthy
  surroundings.
They became unhealthy and pale, shunning physical activity for sitting around
  gaming.
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